Indus Industrial Group supplies heavy-duty Resilient Seated Swing Check Valves equipped with External Lever, Adjustable Counterweight, and Optional Hydraulic Damper across nominal diameters from DN50 to DN1000 in pressure classes PN10, PN16, and PN25 according to EN 1074-3 and EN 12334 standards. Engineered for municipal booster stations, raw river water pumping mains, and wastewater treatment complexes across Iraq, these valves prevent reverse flow and protect expensive pumps from hydraulic shock. Constructed from high-strength ductile iron (EN-GJS-500-7) with fully encapsulated EPDM or NBR rubber discs and stainless steel hinge shafts, they deliver drop-tight backflow prevention with low head loss.
| Pricing Verification | Commercial Quote on Demand (RFQ) |
| Governing Standards | EN 1074-3 / EN 12334 / BS 5153 / ISO 5208 |
| Face-to-Face Standard | EN 558-1 Series 10 (DIN 3202 F6) / Series 48 |
| Nominal Diameter Range | DN50 to DN1000 (Metric Flanged) |
| Pressure Classes | PN10, PN16, PN25 (Bar) |
| Body & Bonnet Material | Ductile Iron EN-GJS-500-7 (min 420 MPa tensile strength) |
| Disc Material | Ductile Iron fully vulcanized in EPDM (Potable) or NBR (Sewage) |
| Body Seat Ring | Corrosion-Resistant Bronze / Stainless Steel 316L |
| Hinge Shaft | Stainless Steel AISI 420 / AISI 316 (High Shear Strength) |
| Corrosion Protection | Fusion-Bonded Epoxy (FBE ≥ 250 µm) inside and out |
| Flange Drillings | EN 1092-2 / ISO 7005-2 (PN10 / PN16 / PN25) |
| Sector & Division | Water & Wastewater (Div 01) |
| Parent Category | Non-Return Check Valves |
Municipal water booster pumping stations, raw river intake pump discharge lines, municipal WWTP aeration and effluent pump stations, industrial cooling circuits, and fire pumping systems across Baghdad, Erbil, Basra, Mosul, Najaf, and Karbala.
Resilient Seated Swing Check Valves equipped with external lever and adjustable counterweight represent the time-tested engineering standard for non-return flow protection in municipal pumping stations and high-pressure water mains across Iraq. Governed by EN 1074-3, EN 12334, and BS 5153 standards, these valves protect booster pumps from catastrophic reverse rotation, backflow surges, and hydraulic water hammer shocks when pumps are shut down or when sudden power outages occur on the Iraqi national electrical grid. The external counterweight can be adjusted along the lever arm to tune the closing speed, ensuring rapid disc closure before reverse flow velocity can accelerate.
The valve body and bonnet are cast from spheroidal graphite ductile iron (EN-GJS-500-7) featuring an unobstructed full-bore hydraulic waterway that minimizes turbulence and pumping head loss. The swing disc is fully encapsulated in vulcanized EPDM (for potable water) or NBR elastomer, sealing against a precision-machined bronze or stainless steel body seat ring to provide bubble-tight shutoff (Rate A per ISO 5208) even under low backpressure conditions. The hinge shaft is manufactured from high-tensile stainless steel (AISI 420 / 316) mounted on maintenance-free low-friction bronze bushings with multiple O-ring shaft seals.
Protected internally and externally with electrostatically applied blue fusion-bonded epoxy (min 250 µm, WRAS certified), the valve is immune to galvanic corrosion in high-salinity Iraqi water. Staged at the Erbil Heavy Plant Yard, Baghdad Central Logistics Hub, and Basra Port Corridor, Indus supplies complete swing check valve assemblies with counterweights, protective safety cages, and EN 10204 3.1 inspection certification.
Moving the counterweight along the lever changes the torque applied to the disc. In systems prone to slam, moving the weight forward accelerates closure so the disc seats precisely at the moment forward flow reaches zero velocity, preventing reverse water velocity from slamming the disc shut and generating water hammer.
Yes. For diameters of DN300 and above, Indus supplies an optional external oil hydraulic dampening cylinder connected to the lever arm. The damper allows the disc to close rapidly through the first 90% of its stroke and then cushions the final 10% of closure, eliminating mechanical slam entirely.
Standard swing check valves are installed in horizontal lines. For vertical lines with upward flow, the lever and counterweight can be re-orientated on-site to assist closure against gravity. Vertical downward flow is not permitted.
